Glossary

Determine door handing by standing outside the door. Whatever side the hinges are on will be your lock handing.

American/U.S. Cylinders Refers to the type of cylinder used with several types of multi-point lock sets. These
cylinders are attached to the escutcheon and do not vary in length, but the tailpiece length
varies according to door thickness. [Category: Lock Mechanisms Terminology]

Backset Backsets for tubular locksets are 2 3/8" or 2 3/4". Backsets for Mortise Locks are most common 2 1/2" or 2 3/4". 2" Backset is available for Baldwin Mortise Locks.

Center To Center Tubular Locks require a cut-out in the door as shown. Many doors are factory prepared like this.
Typically the center-to-center spacing between the cut-outs is 5-1/2 inches. If this is your case, then
most tubular entry locks should fit your door. If you have a different dimension, then a sectional lock
may be used. Always verify the center-to center spacing of the lock before ordering. [View Center To
Center Diagram] [Category: Door Terminology]

Cylinders A portion of a lock where the key is inserted to lock or unlock the set. There are several different kinds
common to different hardware sets. [Category: Lock Mechanisms Terminology]

Dummy - Full This is a set with inoperable handles on both sides of the door (typically used in conjunction with roller
catches, flush bolts or surface bolts). [Category: Lock Terminology, General]

Dummy - Single This is a set with an inoperable handle on one side of the door (typically used in conjunction with roller
catches, flush bolts or surface bolts). [Category: Lock Terminology, General]

Emergency Release This term refers to the capability of a lock to be unlocked from the exterior side in case of an
emergency situation. This is an aspect of most interior privacy lock sets. Most hardware provides an
emergency release key with privacy lock sets. [Category: Lock Mechanisms Terminology]

Entry (Double Cylinder) This is a locking set with operable handles that has a keyed cylinder on both sides of the door
(typically used on primary exterior doors). [Category: Lock Terminology, General]

Entry (Single Cylinder) This is a locking set with operable handles that has a keyed cylinder on the exterior side of the door
and a turn piece on the interior side (typically used on primary exterior doors). [Category: Lock
Terminology, General]

Eurpoean Profile Cylinders The other type of cylinder used with multi-point lock sets. These cylinders slip through the
exterior escutcheon, the door and the interior escutcheon and are held in place by a set
screw through the edge of the lock and vary in length for different door thicknesses.
[Category: Lock Mechanisms Terminology]

Living Finish A "living finish" means that the hardware is not coated, and the finish may change and darken due to
oxidation and wear, much as a copper penny will darken and change over time. [Category:
Miscellaneous Terminology]

Mortise Bolt A locking mechanism that is separate from the latching mechanism and is operated by a
turn piece. It is commonly used for interior applications to provide privacy on bedroom and
bathroom doors. [Category: Lock Mechanisms Terminology]

Mortise Cylinders Mechanisms that are threaded into mortise locks, secured by a set screw through the edge
of the lock and vary in length for different door thicknesses. [Category: Lock Mechanisms
Terminology]

Mortise Lock This mechanism integrates the locking and latching mechanisms into a single cartridge style
lock. The mortise lock is available in a variety of functions such as entry, patio, privacy and
passage. [Category: Lock Mechanisms Terminology]

Multi-Point Lock Mechanisms Mechanisms that latch the door at several points along the length of the door instead of a single point
in close proximity to the handle. Multi-point locks are provided with French doors made by most of the
major window manufacturers. Due to the variety of multi-point sets available, we recommend that a
copy or photo of the existing lock trim or a factory drawing be sent to us so our trim can be machined
correctly to match the lock in the door. [Category: Lock Mechanisms Terminology]

Ornamental Hinge Strap A decorative piece of metal applied to the surface of a door to mimic a strap hinge. [Category: Hinges
Terminology]

Passage This is a non-locking set with operable handles (typically used on doors that do not require security or
privacy such as closets, laundry or utility rooms, pantry, mechanical rooms and so on). [Category:
Lock Terminology, General]

Patio This is a lock set with operable handles that is locked by a turn piece from the interior side, but has no
keyed access from the exterior (typically used on secondary exterior doors). [Category: Lock
Terminology, General]

Privacy (Mortise Bolt or Mortise Lock) This is a locking set with operable handles that is locked by a turn piece from the interior side and can
be unlocked by an emergency release key from the exterior side (typically used on bedroom and
bathroom doors). [Category: Lock Terminology, General]

Privacy (Spring Latch) This is a locking set with operable handles that is locked by a push button on the escutcheon from the
interior side of the door and can be unlocked by an emergency release key from the exterior side
(typically used on bedroom and bathroom doors). [Category: Lock Terminology, General]

Rim Cylinders Mechanisms used in dead bolts that are mounted with screws from the opposite side of the
door. They do not vary in length, but the mounting screw and tailpiece lengths vary
according to door thickness. [Category: Lock Mechanisms Terminology]

Note: This glossary of terms is provided to the consumer as a service, is provided as-is, and is subject to
change. Terms here are provided by LocksUSA.com and are in no way complete or definitive. Please verify
all terms with your salesperson, locksmith, or contractor.